I have a couple of questions on this problem.
P[AuB]=0.7 and P[AuB']=0.9
I understand the substitution via Disjunction Rule to:
Then combining the terms to:
But, the next part seems like hand waving on the right-hand side of the equation.
How do we get to 1-P[(AnB)u(AnB')] from (P[B]+P[B'])-(P[AnB]+P[AnB'])?
The next step suggests:
1.6=2P[A]+1-P[A] and subsequently P[A]=0.6
Also, is there any notable difference between B' (B prime?) and say C or any other variable. Thanks in advance.